Dynatrace MSSQL monitoring provides insights that help pinpoint SQL Server performance issues and identify potential bottlenecks.
Viewing MSSQL monitoring metrics
Captured MSSQL metrics are displayed on MSSQL Process pages. Click the infographic or the **SQL metrics **and **Further details **tabs to view metric details.
|User connections||Number of users connected to SQL Server.|
|Transactions||Number of currently active transactions (all types).|
|Buffer cache hit ratio||The buffer cache hit ratio counter represents how often SQL Server is able to find data pages in its buffer cache when a query requests a data page.|
|The higher this number is the better because it means that SQL Server was able to get data for queries out of memory instead of reading from disk.|
|Page life expectancy||Measures how long pages stay in the buffer cache (seconds). The longer a page stays in memory the more likely that SQL Server won’t need to read from disk to resolve a query.|
|Batch requests||Reflects the number of batches SQL Server receives per second. This counter is a good indicator of how much activity is processed by your SQL Server box.|
|Compilations||The number of times SQL Server compiles an execution plan per second. Compiling an execution plan is a resource-intensive operation. The number of Compilations per second should be compared to the number of Batch requests per second to see if complications are affecting performance.|
|**Recompilations **||When an execution plan is invalid due to some significant event, SQL Server re-compiles the plan. The Re-compilations per second counter measures the number of times a re-compile event is triggered per second.|
|Lock wait time||In order for SQL Server to manage concurrent users on the system, SQL Server needs to lock resources from time to time. The Lock waits per second counter tracks the number of times per second that SQL Server is not able to immediately retain a lock for a resource.|
|Latch wait time||Average Latch wait time in milliseconds for latch requests that had to wait. If this number is high, your server may have resource limitations.|
|Page splits||Measures the number of times per second that SQL Server had to split a page when updating or inserting data. Page splits are expensive and cause tables to perform poorly due to fragmentation. The fewer page splits the better.|
|Processes block||The Processes blocked counter identifies the number of times that a process blocked another process. Blocked processes cannot move forward with an execution plan until the resource that is causing the block is free.|
|Checkpoint pages||Reflects the number of pages written to disk by a checkpoint operation. If this counter is climbing, it may mean that you’re running into memory pressures that are causing dirty pages to be flushed to disk more frequently than normal.|
|Target server memory||Total amount of dynamic memory the server is willing to consume.|
|Total server memory||Memory allocated to the SQL Server.|
|Connection memory||Total amount of dynamic memory the server uses to maintain connections.|
|Memory grants pending||Total number of processes per second waiting for a workspace memory grant.|
|Memory grants outstanding||Total number of processes per second that have successfully acquired a workspace memory grant.|
- Dynatrace v1.85 (or higher)
- Microsoft SQL Server 2008, 2012-2014
- See list of supported MSSQL versions.
To enable MSSQL monitoring globally:
- Open the left-hand navigation menu and select Settings.
- Select Monitored technologies.
- Set the MSSQL **switch to **On.
Note: With MSSQL monitoring enabled globally, when a new host running MSSQL is detected in your environment, Dynatrace automatically collects MSSQL metrics.
Dynatrace also allows you to enable MSSQL monitoring for specific hosts rather than globally. To do this, first disable the global MSSQL monitoring setting explained above then click the **host settings **link near the top of the page.